The objective in Mastodon Chess (8x10) is checkmate. The name not only reflects on the Mastodon piece (also called Mammoth), but also on the size of the board, which is 8x10. Pieces move as in orthodox chess, with the exception of the additional piece, the Mastodon. It jumps two steps diagonally or orthogonally, or steps one square in all directions. It has roughly the same value as Rook + Pawn. The Mastodon jump complements the jump move of the Knight. A Mastodon, together with a King, can give mate to a lonely King. The pawns move as in orthodox chess, inclusive of the initial double-step and 'en passant'. Castling exists, but the King jumps three squares instead of two. As usual, the Rook ends up beside the King. Promotion rules are the same as in orthodox chess (with the addition of the Mastodon).